JP2003036542A - Optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the storage residual quantity to a memory by detecting vibration to reduce power consumption. SOLUTION: When reading stored information from an optical disk recording medium 1 with the pickup 2a of a disk driving part 2 and then storing it into a memory part 3, a focus error signal of a pickup 2a is converted as an oscillation and a vibration quantity in a vibration detecting part 7 to be added to the switching and retaining part 8 of a residual quantity threshold value. When the oscillation and vibration of a fixed quantity or above is detected, the residual quantity threshold value of the memory part 3 is switched to a higher part only during the time specified by the switching part 9 of the holding time of the residual quantity threshold value and then the residual quantity threshold value is returned to the threshold when the vibration is not generated after the time passes. A system controller 6 controls the start and stop of reading from the optical disk recording medium 1 of the disk driving part 2 and then controls so that the residual quantity of the memory part 3 is between the threshold value and saturation value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus for reproducing acoustic data, and more particularly to reduction of power consumption in an optical disk reproducing apparatus capable of reproducing while preventing skipping due to vibration at the time of reproducing acoustic data. .

[0002]

2. Description of the Related Art In recent years, an optical disk reproducing apparatus for reproducing information such as music recorded on an optical disk recording medium such as an optical disk and a magneto-optical disk has been widely used. A typical example of such an optical disk reproducing device is a compact disk (Compact Disc: C hereinafter).
D) players and mini disc (hereinafter referred to as MD) players, and these players reproduce audio signal information recorded on a recording medium such as a CD or MD.

When these optical disk players are used for portable use, the pickup does not trace properly due to external vibration, resulting in skipping of sound and interruption of reproduced sound. In order to prevent this, there is a method of temporarily storing information of an optical disk recording medium in an internal storage device capable of recording a certain amount of information, reading the stored information, and reproducing music information.

FIG. 8 is a block diagram of a conventional optical disk reproducing apparatus. In FIG. 8, the system controller 6 reads the reproduction information from the optical disc recording medium 1 by the optical pickup 2a as a reading unit by mounting the optical disc recording medium 1 on the disc drive unit 2 which is a disc driving unit and rotating the same. The read information is temporarily stored in the storage unit 3 by the internal storage area storage unit, then read from the storage unit 3 and subjected to signal processing in reproduction by the signal processing unit 4. Signal processing unit 4 which is a reproducing means
Then, the data read from the recording unit 3 is demodulated and expanded, decoded and output from the output terminal 5 as an audio signal. The system controller 6 controls the disk drive unit 2, the storage unit 3, and the signal processing unit 4 to be described later.

At this time, the system controller 6 constantly monitors the amount of music information stored in the storage unit 3 as a stored information amount monitoring means, and the information of the optical disk recording medium 1 is stored in the storage unit 3. When the amount of information becomes larger than the amount of music information required for the signal processing unit 4 which reproduces the music information by using the music information, the system controller 6 serves as a read stopping unit.
Then, the reading of information from the optical disc recording medium 1 is stopped. On the contrary, when the amount of the music information stored in the storage unit 3 of the information of the optical disc recording medium 1 becomes smaller than the amount of the music information necessary for the signal processing unit 4 which reproduces the music information using the music information. The system controller 6 causes the disk drive unit 2 to start reading the information of the optical disk recording medium 1 again as a reading start means.

By the control as described above, it is not necessary to always read the information recorded on the optical disk recording medium such as the optical disk and the magneto-optical disk into the internal storage device.
By reading data intermittently, power consumption is suppressed, and it is possible to improve the playback time of the optical disc in actual use. In addition, if vibration occurs when reading the information of the optical disc recording medium 1 from the disc drive unit 2, the information may not be read correctly, and as a result, the read information is interrupted and the reproduced sound is interrupted.

Therefore, a predetermined permissible time is set in consideration of vibration when reading information in advance, and the system controller 6 determines when the amount of information recorded in the storage unit 3 reaches a threshold value corresponding to the permissible time. Then, the reading of the information of the optical disc recording medium 1 to the disc drive unit 2 is started again. As a result, it is possible to reproduce a disc that is comfortable for the user without interruption of the reproduced sound due to vibration.

[0008]

In the conventional optical disk reproducing apparatus as described above, it is considered that vibration or shaking always occurs, and the threshold value of the remaining amount of data in the storage unit 3 is set to a high threshold value. The reading from the optical disk recording medium 1 is started when the value is close to, and the reading from the optical disk recording medium 1 is stopped when the value is close to the saturation value, so that a predetermined amount of data or more is always stored in the storage unit 3. ing. Therefore, the remaining amount fluctuates slightly between the threshold value and the saturation value, and reading from the optical disc 1 and stopping are frequently repeated. However, each time the reading is started, the stopped disk drive unit 2 has to perform tracking error correction, focus error correction, and the like of the pickup, and a large current also flows when the spindle motor is started. There is a problem that the battery becomes large and the reproducible time on the battery becomes short.

Generally, in an optical disk reproducing apparatus using a constant power source such as a battery, an optical disk reproducing apparatus is desired which has a longer reproduction time and does not cause interruption of reproduced sound due to vibration. Therefore, it is desirable to prevent the sound skipping and to reduce the power consumption by effectively using the internal storage device according to the vibration and the shaking.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to reproduce for a long time by detecting vibrations and shaking and effectively utilizing an internal storage device according to the vibrations and shaking. The purpose of the present invention is to provide a possible optical disc reproducing apparatus.

[0011]

In order to solve this problem, the optical disk reproducing apparatus of the present invention is the optical disk reproducing apparatus according to claim 1,
A disc drive means for rotatably driving the optical disc recording medium to read information data recorded on the optical disc recording medium by an optical pickup, and a shift in the vertical direction of the optical pickup with respect to the surface of the optical disc recording medium in the disc drive means using a focus error signal. A focus function unit that is driven to detect and correct the shift, a vibration sensing unit that converts a focus error signal in the focus function unit as a vibration amount applied to the optical disc recording medium, and an optical pickup of the disc drive unit. A reading means for reading information such as a music signal which is modulated and recorded on the optical disc recording medium by using the reading means; an internal storage area storing means for storing the information read by the reading means in an internal storage area; The internal memory The area storage means reads out information stored in the internal storage area, performs demodulation processing, and reproduces it as music information, and the current storage area stored in the internal storage area using the internal storage area storage means. When the information stored in the internal storage area is saturated using the stored information amount monitoring means for constantly monitoring the amount of information and the stored information amount monitoring means, the reading of information from the optical disc recording medium by the reading means When the information stored in the internal storage area reaches a certain amount of reduced remaining amount by using the reading stopping means for stopping the reading and the stored information amount monitoring means, the reading is restarted from the optical disk recording medium. The read start means, and the remaining amount used for the determination for starting the operation of the read start means according to the degree of vibration sensed by the vibration sensing means. Characterized by comprising a battery level threshold switching means for switching the threshold.

As a result, by constantly lowering the remaining memory threshold value of the internal storage area, the number of accesses to the optical disk recording medium is reduced, the power consumption is reduced, and when the vibration sensing means detects that vibration or shaking has occurred. The remaining capacity threshold value switching means controls to increase the memory remaining capacity threshold value of the internal storage area, the power consumption is suppressed by the efficient use of the internal storage device according to the environment, and the reproduction time of the disc in actual use is improved. And the reproduction sound is not interrupted by vibration.

According to a second aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, the remaining amount threshold value switching means switches the remaining amount threshold value by weighting the amount of vibration and the number of vibrations within a fixed time. Is characterized by
This acts so that the vibration can be detected under different conditions.

According to a third aspect of the present invention, in the optical disk reproducing apparatus of the first aspect, the remaining amount threshold value switched by the remaining amount threshold value switching means is set to that value within a certain fixed time, and the fixed time is set. When it reaches, the residual quantity threshold value holding means for returning to the initially set residual quantity threshold value is provided.

With this configuration, even if vibration occurs, it acts to keep the remaining amount threshold high for a while in preparation for the occurrence of vibration again.

An optical disk reproducing apparatus according to a fourth aspect of the present invention is the optical disk reproducing apparatus according to the third aspect, further comprising a remaining amount threshold holding time switching unit, and the remaining amount threshold holding time switching unit holding the remaining amount threshold constant time. It is characterized in that the fixed holding time in the means can be set to an arbitrary or predetermined time.

With this configuration, the holding time in the remaining amount threshold holding time switching means can be set to an arbitrary or predetermined time according to the environment.

According to a fifth aspect of the present invention, in the optical disk reproducing apparatus according to the first to fourth aspects, the vibration sensing means stops the sensing function when the reading stopping means stops reading, and the reading start means reads the data. It is characterized in that the operation of the sensing function is started at the start.

As a result, the sensing function is not always driven, but is interlocked with the intermittent reading of information from the optical disc recording medium, and the sensing function is stopped when it is not necessary to further reduce the power consumption during disc playback. To do.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4.
In the present embodiment, the remaining capacity threshold value of the storage unit is set to a low value by default, and when a shake or vibration of a certain amount or more is detected, the remaining capacity threshold value is increased for a certain period of time and returned to the default value after a certain period of time. That is what it does. 1 is a block diagram of an optical disk reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, the parts denoted by the same reference numerals as those in FIG. 8 have the same functions, and the description thereof will be omitted. Figure 2
Is the inside of the disk drive unit 2 that detects the deviation of the optical pickup 2a for reading the information recorded on the optical disk recording medium 1 such as an optical disk in the vertical direction with respect to the surface of the optical disk recording medium, and drives so as to correct the deviation. 3 is a block diagram of the focus function in FIG. 3, FIG. 3 is an explanatory view showing details of the photodetector 13 and an outline of focus error, and FIG. 4 is a flow chart showing an operation of holding the remaining amount threshold value for a predetermined time.

In FIG. 1, a vibration detection unit 7 converts a focus error signal obtained from the disc drive unit 2 into a vibration amount of the optical disc recording medium 1 itself as a vibration detection means, and detects a certain amount of vibration. , And requests the remaining amount threshold switching / holding unit 8 to be described later to perform switching output of the remaining amount threshold. The remaining amount threshold switching unit and the remaining amount threshold switching / holding unit 8, which is the remaining amount threshold constant time holding unit, uses the switching output obtained from the vibration detection unit 7 as a signal and uses it for the determination for starting the re-reading. The threshold of the quantity value is switched. Then, the threshold value is held within a designated fixed time, and when the time comes, control is performed to switch to the remaining amount threshold value before switching output is obtained. The remaining threshold value holding time switching unit 9 as the remaining threshold value holding time switching unit is an input unit that can externally set an arbitrary time to hold the remaining threshold value within a designated fixed time. The stored holding time value is passed to the remaining amount threshold switching / holding unit 8, and the remaining amount threshold switching / holding unit 8 sets the value as the remaining amount threshold holding time.

Next, the focus function means for detecting the deviation of the optical pickup in the vertical direction with respect to the surface of the optical disk recording medium by using the focus error signal and driving so as to correct the deviation will be described. In FIG. 2, the light source 11 emits light for reading the information recorded on the optical disc recording medium 1. The objective lens 12 is for focusing the light emitted from the light source 11 on the optical disc recording medium 1. The photodetector 13 detects the amount of light reflected by the optical disc recording medium 1 and converts it into a voltage value. The beam splitter 14 polarizes only the light emitted from the light source 11 through the objective lens and reflected by the optical disc recording medium 1 to the photodetector 13 side. In the cylindrical lens (cylindrical cross-section lens, semicylindrical lens) 15, one lens cross section has a lens shape, and the other lens cross section is rectangular. The lens-shaped cross-section has a function of condensing or forming an image. On the other hand, the rectangular cross section causes light to go straight. Because of such a configuration,
When the light incident on the cylindrical lens 15 is incident light that is perpendicular to the entrance aperture surface, a light beam of a circular luminous flux is obtained, and when the incident light is inclined, a light beam of an elliptical luminous flux is obtained. It has characteristics.

In FIG. 3, the photodetector 13 is divided into four parts A1, A2, A3 and A4 as shown in the drawing. The differential amplifier 16 is designed so as to calculate the amount of light in each region of the photo detector 13 divided into four as follows, and uses the terminal 17 as a detection voltage.
Is output to.

(A3 + A4) − (A1 + A2) = (Detection Voltage) Here, in FIG. 3, (a) is the optical disk recording medium 1
And the objective lens are too far away, (b) is in focus, and (c) is the cylindrical lens 15 when the optical disk recording medium 1 and the objective lens are too close.
The shape of the beam converged on the surface of the photodetector 13 by the action of is shown. (D) is the above (a)
The characteristic of the detection voltage in each case in (c) is shown.

Therefore, since the beam shape is different in each case, the differential amplifier 16 can obtain a graph of the detected voltage at the position of the objective lens as shown in the figure. This detected voltage is called a Focus Error (focus error, hereinafter abbreviated as FE) signal, and indicates a deviation in the vertical direction with respect to the optical disk recording medium surface. The focus function is to use this FE signal to correct the vertical shift with respect to the optical disk recording medium surface and focus.

Note that the focus function shown here is an example, and the one configured to detect the deviation in the direction perpendicular to the surface of the optical disk recording medium and to drive so as to correct the deviation is the same. It is not limited.

The operation of the optical disc reproducing apparatus configured as described above will be described below with reference to the flowchart of FIG. The vibration detection unit 7 is the disk drive unit 2
The obtained FE signal is converted into the vibration amount of the optical disc recording medium 1 itself, and when the vibration of a certain amount or more is detected, the remaining amount threshold switching / holding unit 8 is requested to perform the switching output of the remaining amount threshold.
The remaining amount threshold switching / holding unit 8 detects the vibration detecting unit 7 in step S1.
If there is a request for switching the remaining amount threshold value due to vibration, the threshold value of the remaining amount value used for the determination for restarting reading from the optical disk recording medium 1 is changed in step S2. Regarding the degree of vibration and the threshold of the remaining amount, when the amount of vibration or shaking is small, it is possible to set the threshold of the remaining amount low because the degree of vibration countermeasures for disc playback is small, and as a result, reading starts frequently. It is not necessary to do so, and it becomes possible to prolong the read suspension period.

On the other hand, when the amount of vibration or shaking is large, the level of the residual quantity threshold is set high because the measure against vibration during disk reproduction is large.

Therefore, it becomes possible to efficiently use the internal storage device in accordance with vibrations and shakes, so that useless power consumption can be suppressed and the reproduction time in actual use can be improved.

The remaining threshold value holding time switching unit 9 can externally set the remaining threshold value that the remaining threshold value switching / holding unit 8 should hold. The holding time value set in step S3 is passed to the remaining amount threshold switching / holding unit 8, and the remaining amount threshold switching / holding unit 8 sets the value as the remaining amount threshold holding time. Once the vibration detection unit 7 detects shaking or vibration of a predetermined amount or more and sets the remaining amount threshold switching / holding unit 8 to increase the remaining amount threshold, the remaining amount threshold holding time switching unit 9 sets the set value. Operates to hold for the set time. As a result, it is possible to set an arbitrary holding time according to the magnitude of the vibration or shaking of the environment used by the user, and it is possible to easily set the vibration countermeasure depending on the environment during disk reproduction. This setting can be performed manually as described above, or can be a predetermined value. When the remaining amount threshold value holding / holding timer of the remaining amount threshold value switching / holding unit 8 times out in step S4, the default remaining amount threshold value, that is, the smaller remaining amount threshold value when there is no vibration is switched, and the time from the start of reading to the stop of reading is changed. Longer and longer downtime. After that, the remaining amount of the memory is continuously monitored in step S6,
Return to step S1.

Further, the vibration detecting section 7 can be controlled so that the sensing function is stopped when the reading is stopped and the sensing function is started again when the reading is started. With such a configuration, the sensing function is always driven. Instead, the power consumption during disk reproduction can be further reduced by interlocking with the intermittent reading of information from the optical disk recording medium and stopping the sensing function when it is not necessary.

As described above, in this embodiment, the FE
The signal is used as a means for detecting vibration or shake given from the outside, and when the vibration detecting unit 7 detects that the amount of vibration or shake is a certain amount or more, it outputs a switching output, and the remaining amount threshold value switching / holding unit 8 Since the remaining amount threshold value is switched to a higher value, the remaining amount threshold value is raised for a certain period of time held by the remaining amount threshold value holding time switching unit 9, and the remaining amount threshold value is lowered when there is no vibration or shaking.
The average value of the amount of storage data stored in the storage unit 3 at all times is low, and the power consumption is small.

(Embodiment 2) In Embodiment 1, a shake or vibration of a certain amount or more is sensed, and the threshold of the remaining amount is switched each time. In the present embodiment, attention is paid to the magnitude of the shaking or vibration that appears within a predetermined time and the number of times, weighting is performed on the magnitude and the number of times, and the remaining amount threshold value corresponding thereto is set. 5 is a block diagram of an optical disk reproducing apparatus according to Embodiment 2 of the present invention, FIG. 6 is an operation explanatory diagram of the focus error level monitoring counter thereof, and FIG. 7 is an operation flowchart of the focus error level monitoring counter thereof.

In FIG. 5, portions having the same functions as those in FIG. The functions of the system controller 6a, the vibration detection unit 7a, and the remaining amount threshold switching / holding unit 8a are different from those in FIG. In FIG. 6, the vibration detector 7a subdivides the value of the FE signal with the passage of time into the levels of L1 to Ln for each unit time t, detects the fixed time T into L counts, and shakes and vibrates during that period. Evaluate.

In FIG. 7, the FE level monitoring counter is activated at every time t, the FE signal monitoring process is started in step S7, and the FE signal level is monitored and stored in step S8. In step S9, 1 is added to the FE level monitoring counter, in step S10 the FE signal level stored in step S8 is determined, and if the level is L1 or higher, 1 is added to the L1 level frequency counter in step S11. If the FE is not equal to or higher than the L1 level in step S10, it is determined whether or not the FE is equal to or higher than the L2 level in step S12.
If L2 or less, it is determined in step S14 whether Ln or more and 1 is added to the corresponding level counter.

In step S16, if the FE level monitoring counter is L or more, the process proceeds to step S17. In step S17, it is determined whether or not there is vibration, and the weighting of the frequency counter of each level is performed. For example, the counter of the L1 level is multiplied by 5 and the counter of the L2 level is tripled. If the count is N or more, it is determined that there is vibration, and the remaining amount threshold is switched. In step S18, a request for switching to the remaining amount threshold corresponding to the frequency count is issued to the remaining amount threshold switching / holding unit 8a. To do. If the count is equal to or less than N in step S17, it is considered that there is no vibration, and the remaining amount threshold value is set as a default value in step S19, and the process proceeds to step S20. In step S20, the frequency counters of all levels are initialized, and the process ends in step S21. The remaining amount threshold switching / holding unit 8 holds the remaining amount threshold until the next cycle.

As described above, according to the present embodiment, weighting is performed according to the magnitude and number of shaking and vibration levels within a certain period of time, and the threshold of the remaining amount of the storage unit is switched according to this value. By setting the remaining amount threshold according to the amount of, it is possible to lower the remaining amount threshold when there is no vibration, reduce power consumption, and lengthen the reproduction time.

It should be noted that although the two expressions of shaking and vibration are used here, shaking is vibration with a long cycle,
It is considered that the influence on the pickup 2a is greatly influenced by the acceleration, and it is practical to detect by the value of the focus error.

[0039]

As described above, according to the present invention, it is possible to effectively use the internal storage device by sensing the vibration or the shake and switching the remaining capacity threshold of the internal storage device according to the vibration or the shake. The number of times of starting reading from the optical disk storage medium is reduced, useless power consumption at the time of starting reading is suppressed, and an effective effect that the playback time in actual use can be extended while preventing interruption of the playback sound due to vibration is obtained.

In addition, since the existing basic servo function is utilized, it is not necessary to newly add a sensor for detecting vibration, and an effective effect that it can be realized at low cost can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical disk reproducing device according to a first embodiment of the present invention.

[FIG. 2] Similarly, a block diagram of the focus function thereof.

FIG. 3 is a diagram showing the details of the photo detector and an outline of focus error.

FIG. 4 is a flowchart showing an operation of holding the remaining amount threshold value for a predetermined time.

FIG. 5 is a block diagram of an optical disk reproducing device according to a second embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of the focus error level monitoring counter of the same.

[Fig. 7] Similarly, an operation flowchart of the focus error level monitoring counter.

FIG. 8 is a block diagram of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

1 Optical disc recording medium 2 Disk drive section 2a Optical pickup 3 storage 4 Signal processing unit 5 output terminals 6,6a System controller 7,7a Vibration detector 8.8a Remaining amount threshold switching / holding 9 Remaining threshold value holding time switching unit 11 light source 12 Objective lens 13 Photo detector 16 differential amplifier

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kinji Hashimoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yoshihiro Tomikura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5D090 AA01 BB02 CC04 DD02 EE11                       GG10 HH02 JJ09

Claims (5)

[Claims] 1. A disk drive means for rotatably driving an optical disk recording medium to read information data recorded on the optical disk recording medium by an optical pickup, and a deviation of the optical pickup in the disk drive means in a direction perpendicular to an optical disk recording medium surface. A focus function unit that detects the focus error signal using the focus error signal and drives the focus error signal to correct the shift; a vibration sensing unit that converts the focus error signal in the focus function unit into a vibration amount given to the optical disc recording medium; Read-out means for reading out information such as a music signal which is modulated and recorded on the optical disk recording medium by using the optical pickup of the means, and an internal section for storing the read-out information in the internal storage area by using the read-out means. Storage area Reproducing means for reading information stored in the internal storage area by using the internal storage area storage means and performing demodulation processing and reproducing as music information; and using the internal storage area storage means, When the information stored in the internal storage area is saturated by using the stored information amount monitoring means for constantly monitoring the amount of current information stored, the optical disc of the reading means When the information stored in the internal storage area decreases and reaches the threshold value of the remaining amount by using the read stop means for stopping the information read from the recording medium and the stored information amount monitoring means,
A read start unit that starts reading again from the optical disk recording medium, and a threshold value of the remaining amount used for determination for starting the operation of the read start unit according to the degree of vibration sensed by the vibration sensing unit. An optical disk reproducing device comprising: an amount threshold switching means. 2. The optical disk reproducing apparatus according to claim 1, wherein the remaining amount threshold value switching means switches the remaining amount threshold value by weighting the amount of vibration and the number of vibrations within a fixed time. 3. The remaining amount threshold value switched by the remaining amount threshold value switching means is set to that value within a certain fixed time, and when the fixed time is reached, the remaining amount threshold value returned to the initially set remaining amount threshold value. The optical disc reproducing apparatus according to claim 1, further comprising a holding means for a certain period of time. 4. A remaining amount threshold holding time switching unit is further provided, and the remaining amount threshold holding time switching unit can set a fixed holding time in the remaining amount threshold constant time holding unit to an arbitrary or a predetermined time. The optical disc reproducing device according to claim 3. 5. The vibration sensing means stops the sensing function when the reading is stopped by the reading stopping means, and starts the sensing function when the reading is started by the reading starting means. The optical disk reproducing device according to any one of the above.